Juergen Freund / Aerial of Sturt Stoney Desert with gibber rocks. Gibber rocks are millions of years wind and water weathered chalcedonised sandstone with a hardened crust of soil cemented silica, iron and manganese,...
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Jack Dykinga / Valle de la Luna, The Codillera de Sal, formed by layer upon layer of salt, sand and clay, creating strata that buckled with earth's crust and lined with sand dunes. Atacama Desert, Chile. April 2009
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Chadden Hunter / Dallol hot springs where water heated by magma laden with potassium, sulphur and iron spews up through salt pans staining the salt deposits with vivid colours, in the bottom of the Rift Valley, 120 me...
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Wild Wonders of Europe / Lundgren / Blue rayed limpet (Patina / Ansates pellucida) on seaweed with Sea-mat / Lacy crust bryozoan (Membranipora membranacea) on shell, Saltstraumen, Bod, Norway, October 2008
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Wild Wonders of Europe / Lundgren / Blue rayed limpet (Patina / Ansates pellucida) with Sea-mat / Lacy crust bryozoan (Membranipora membranacea) growing on shell, Saltstraumen, Bod, Norway, October 2008
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Wild Wonders of Europe / Lundgren / Three Nudibranchs (Polycera quadrilineata) on Kelp encrusted with Sea-mat / Lacy crust bryozoan (Membranipora membranacea) Saltstraumen, Bod, Norway, October 2008
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Owen Newman / Soda crust on Lake Natron, Tanzania, coloured red by alkali cyanobacteria, breeding site of endangered Lesser Flamingo
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Richard Du Toit / African elephant sprays itself with mud {Loxodonta africana} Linyanti, Botswana, Southern Africa. The mud-pack, when dry, forms a hard crust that deters insect attacks.
Nick Upton / Close up of Coralline crust (Lithophyllum tortuosum) an encrusting coralline red algae growing on intertidal rocks exposed at low tide, Asturias, Spain, August.
